ipcLockProtocol.cpp

/* ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is Mozilla IPC. * * The Initial Developer of the Original Code is * Netscape Communications Corporation. * Portions created by the Initial Developer are Copyright (C) 2002 * the Initial Developer. All Rights Reserved. * * Contributor(s): * Darin Fisher <darin@netscape.com> * * Alternatively, the contents of this file may be used under the terms of * either the GNU General Public License Version 2 or later (the "GPL"), or * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */#include <stdlib.h>#include <string.h>#include "prlog.h"#include "ipcLockProtocol.h"//-----------------------------------------------------------------------------staticinline PRUint8 get_opcode(const PRUint8 *buf)
{
return (buf[0] & 0x0f);
}
staticinline PRUint8 get_flags(const PRUint8 *buf)
{
return (buf[0] & 0xf0) >> 4;
}
staticinlineconstchar *get_key(const PRUint8 *buf)
{
return ((constchar *) buf) + 1;
}
//-----------------------------------------------------------------------------
PRUint8 *
IPC_FlattenLockMsg(const ipcLockMsg *msg, PRUint32 *bufLen)
{
PRUint32 len = 1 // header byte
+ strlen(msg->key) // key
+ 1; // null terminator
PRUint8 *buf = (PRUint8 *) ::operatornew(len);
if (!buf)
returnNULL;
buf[0] = (msg->opcode | (msg->flags << 4));
memcpy(&buf[1], msg->key, len - 1);
*bufLen = len;
return buf;
}
void
IPC_UnflattenLockMsg(const PRUint8 *buf, PRUint32 bufLen, ipcLockMsg *msg)
{
PR_ASSERT(bufLen > 2); // malformed buffer otherwise
msg->opcode = get_opcode(buf);
msg->flags = get_flags(buf);
msg->key = get_key(buf);
}